Some people may believe a person can get pregnant that way because it happened to them. What they don't take into consideration is that even tho the guy comes in the anus, if any of that cum leaks from the anus right into the vagina lips and makes it successfully inside immediately after him coming, those sperm are still alive. If in foreplay, mutual masturbation, or any type of play where his pre cum sperm got deposited on the labia even tho he did not enter, or sperm was on his or her finger which then were inserted inside her, then she can be become pregnant those ways too. But because they never had penis-vag. sex, they assume it means you get pregnant through the anus.
It takes the sperm at least three days to travel to the females ready egg if deposited in the vagina and only one egg will be successful. Since they are so small and travel so slowly, the likelihood of sperm living long enough to travel from inside her anus to the outside of her and crawl along on wet skin from the anus to the vagina is very slim, there'd have to be a great gush of liquid that comes out the anus and depending on gravity and the way she's positioned, it can dribble straight to the vagina entrance in a split second.
this is why it's better for the female to be on some kind of birth control like the pill or IUD, and leave the condom for protection against STD's, because either the condom gets forgotten in the frenzy of the moment, is used improperly or sperm gets inside her vagina in some way other than through the penis being inside. [ Dragonflymagic's advice column | Ask Dragonflymagic A Question ]
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